CODEWITHSUNDEEP
androidmultithreading
Shivam Kumar
Shivam Kumar

Reputation: 1892

How to remove freeze UI when execute handler.postDelayed in Android?

I need to show a toast after every 10 seconds, so I can use handler.postDelayed thread to solve this. But this thread freeze UI for 1-2 seconds, so how can I remove the freeze UI?

This is my code:

Runnable runnable = new Runnable() {
    @Override
    public void run() {
        gps = new TrackGPS(this);
        if (gps.canGetLocation()) {
            longitude = gps.getLongitude();
            latitude = gps.getLatitude();
            Geocoder geocoder = new Geocoder(this, Locale.getDefault());
            List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);
            String address = addresses.get(0).getAddressLine(0);
            mTextView.setText(address + "\n" + "Lat:" + latitude + "Lon:" + longit‌​ude);
        }
        handler.postDelayed(this, 10000);
    }
};

Handler handler = new Handler();
handler.postDelayed(runnable, 10000);

Upvotes: 2

Views: 1943

Answers (1)

nandsito
nandsito

Reputation: 3852

Here's an Activity class that shows where you should declare and initialize some fields, as well as how to run geocoder in a background thread with AsyncTask. The code doesn't compile as is because the original code snippet is missing some types and declarations.

public class MainActivity extends Activity {

    private Handler mHandler;

    private Runnable mRunnable;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Initialize other stuff

        mHandler = new Handler(Looper.getMainLooper());

        mRunnable = new Runnable() {
            @Override
            public void run() {
                new LocationAsyncTask().execute();
            }
        };

        mHandler.postDelayed(mRunnable, 10000);
    }

    private class LocationAsyncTask extends AsyncTask<Void, Void, String[]> {
        @Override
        protected String[] doInBackground(Void... params) {
            gps = new TrackGPS(this);
            if (gps1.canGetLocation()) {
                longitude = gps.getLongitude();
                latitude = gps.getLatitude();
                Geocoder geocoder = new Geocoder(MainActivity.this, Locale.getDefault());
                List<Address> addresses = geocoder.getFromLocation(latitude, longitude, 1);
                String address = addresses.get(0).getAddressLine(0);
                String[] strings = new String[3];
                strings[0] = address;
                strings[1] = latitude;
                strings[2] = longitude;
                return strings;
            } else {
                return null;
            }
        }

        @Override
        protected void onPostExecute(String[] strings) {
            super.onPostExecute(strings);
            if (strings != null) {
                updateText(strings[0], strings[1], strings[2]);
            }
            mHandler.postDelayed(mRunnable, 10000);
        }
    }
}

Upvotes: 1

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